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International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 08 Issue: 03 | Mar 2021 www.irjet.net p-ISSN: 2395-0072
BUCKLING ANALYSIS AND REINFORCEMENT DETAILING OF SLOTTED
BRIDGE PIER
Krunalsinh Virpura1, Snehansu Nath2
1Dept. of Civil Engineering, Parul University, Vadodara, Gujarat. 2Associat Professor, Dept. of Civil Engineering, Parul University, Vadodara, Gujarat.
---------------------------------------------------------------------***---------------------------------------------------------------------Abstract - Slotted bridge pier can eliminate scouring amount at a great extent. The Bridge pier is axially loaded member so, it is necessary to do buckling analysis for checking its vertical stability and displacement under maximum applied load. Slotted Bridge Pier can take load just similar of solid circular bridge pier but need to provide suitable pattern of reinforcement. By taking same percentage of reinforcement used in normal circular bridge pier, reinforcement pattern of Slotted Bridge Pier can be design. In reinforcement detailing of SBP, must need to design slab over slot to take excessive weight of concrete over slot. When SBP is under loading condition maximum stress develop at middle of bridge pier i.e. just at top of slot. To encounter this riddle, provided suitable reinforcement pattern.
Key Words: Buckling analysis, Reinforcement detailing, Displacement, slab reinforcement, stability Of SBP, Reinforcing as a column.
1. INTRODUCTION When discussing about the infrastructure in India, and more specifically, the problem facing India’s infrastructure, Bridges
failure have been one of the leading problem facing India’s infrastructure. Bridge failures are costly in the construction, lives lost,
and replacement funds required rebuilding failed bridges.. Till now many of bridges get collapse/failed over water bodies. The
flow of water in a river and streams excavates and moves materials from bed and banks of streams and from around the bridge
pier and abutments. Correspondingly, foundation of the structures are undermined by this erosive action of the flowing water
which is named as Scour (see fig. 1) [1]
Scouring may severely damage the pier of bridge or sometimes it’ll collapse the bridge too. CHADOORA Bridge located at
Teshil Chadoora in Kashmir (J&K), LANGI DURG Road Bridge in Balaghat district (Madhya Pradesh), JAHU Bridge (Himachal
Pradesh), Bridge on Savitri River (Maharashtra) Collapsed in 2016, 30 major as well as minor bridges (Kashmir) collapsed in
2014 and many more . These are the few examples of failed/collapse bridges due to scouring action around bridge pier as well as
in its foundation.
Figure 1Mechanism of Scouring Around Circular Bridge Pier
Yee-Meng Chiew Suggested one of the best countermeasure to reduce the scoring 1992. He had suggested unique type of
bridge pier named Slotted Bridge Pier in his Research work on SCOUR PROTECTION AT BRIDGE PIERS. As per his Research work
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 08 Issue: 03 | Mar 2021 www.irjet.net p-ISSN: 2395-0072
he had constructed slot through a bridge pier, either near the bed or near the water surface [see Figs. 1(a) and (b)]. A slot near
the bed [Fig. 1(a)] diverts the down-flow through the slot opening, thus reducing its erosion potential. A slot near the water
surface [see Fig. 1(b)] allows near-surface water to pass through the slot opening, thereby creating a similar effect as a lower flow
depth. The lower effective flow depth has an important influence on the depth of scour. Experiments showed that it is very
effective in reducing scour depth. By placing a one-fourth diameter wide slot near the water surface or the bed level, it is possible
to reduce the clear-water scour by as much as 20%. A one-half-diameter-wide slot placed near the water surface can reduce the
clear-water scour depth by as much as 30%. [2]
Figure 2(a) Bridge Pier with Slot near sediment bed (b) Bridge Pier near Water surface
1.1 Literature Review
Ali khudabakshi et al Studied in their experiment, when height of slot is below the stream bed it proves more effective on reducing scouring amount. As a result scouring depth will be reduced up to 20.34% to 39.73% and scour volume approximately 46.89% to 75.74% when slot is provided at the bed of stream [3].
M. Osroush et al examines that when slot in abutment placed closer to the bed, it would be more effective in reduction of
Scouring. Also experimented that if the height of slot is higher than the depth of were showed a batter performance [4]. Kumar et al investigated the reduction of local scouring around Bridge pier in a direct stream with the use of a slot and collar.
Their results shows that the slot was effective in reducing scoring but slotted pier would not be effective if flow approaching the pier shows great deviation [5].
A.T. Moncada-M et al had found that when the collar was placed at the bed level, the minimum scoured depth reached, also
investigated the scour depth is inversely proportional to the diameter of the collar. In future result they added that if slot is placed near to the bed level, it found most effective in reducing scouring depth, in future comments they said that if slot length increases the scouring depth decreases. When applying the collar and slot combination scouring depth almost entirely eliminated [6].
M. Heydarnejad et al investigated effect of slot on scouring around pier in different position of 180-degree bends and as a
conclusion found that reduction in scour depth is 24% [7]. Hooman Hajikandi et al performed various experiment on Y-slot and T-slot bridge pier in comparison with simple straight
bridge pier. [8] Heydarpour et al The findings revealed that the group of bridge piers has a great impact on the depth of scouring on the rear
part of the pier compared with an individual pier. They also concluded that the effect of the slot on reducing scouring depth increases in parallel with the increase in the pier area, also added that if spacing between the piers increases, unprotected area between piers is washed away resulting deeper scour holes at the rear piers. [9].
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 08 Issue: 03 | Mar 2021 www.irjet.net p-ISSN: 2395-0072
Carmelo Grimaldi et al experimented that slot may reduce local scour depth at bridge pier about 30% (about 70% for both scour area and volume). In addition also experimented that combination of slot and bed sill at downstream of the river can reduced scour depth approximately 45% (about 80% and 90% for scour area and volume, respectively) [10].
2. METHODOLOGY In the first phase, we’ve consider control model of bridge pier i.e. the bridge pier with no slot condition. We’ve to do the comparison of buckling factor as well as lateral displacement between slotted bridge pier and control model at the end of the work to get the appropriate result about the vertical stability of slotted bridge pier.
After deciding the parameters i.e. size of control model (bridge pier with no slot condition), we’ve calculate intensity of loads that are going to be applied on control model. So, we took dead load, live load in the account and applied vertically on control model. In Post-processing mode we got the percentage of longitudinal reinforcement for control model.
Now, in the next phase we need to calculate same percentage of longitudinal reinforcement that we got from control model, that same percentage of steel we had rearrange in slotted bridge pier with different pattern. Later-on control model with reinforcement is analyzed in ABAQUS software by FEM, and in the result we got lateral displacement as well as buckling factor.
In further steps, slotted bridge pier with different pattern of rebar is analyzed in ABAQUS software and as an output we aim to get result just similar to the control model. I.e. lateral displacement and buckling factor of slotted bridge pier. So that we could comment on its vertical stability.
Now, in subsequent phase we’ve compare results of both slotted bridge pier and control model aim to get vertical stability of slotted bridge pier over control model under same amount of load, and if we can’t get such result, so that we need to change pattern of reinforcement for slotted bridge pier and again analyzed it in ABAQUS.
Repeated the above step till the appropriate result comes.
3. STRUCTURE CONFIGURATION
3.1 Parameters:
Characteristics of concrete:
Grade of concrete ( fck ) = M25 Elasticity of concrete (E) = 500 (fck)1/2 N/mm2 Poisson’s ratio of concrete (µ) = 0.1 to 0.2 Density of concrete (ρ) = 2400 Kg / m3
Characteristics of steel:
Grade of steel (fst) = fe415
Elasticity of steel (Es) = 2 * 105 N/mm2
Poisson’s ratio of steel (µs) = 0.3
Density of steel (ρs) = 7850 Kg / m3
1) Span of Bridge = 40 m
2) Size of Control Model:
Diameter (D) = 5 m
Height (H) = 10 m
3) Parameters of Slotted Bridge Pier:
Diameter of SBP (D0) = 5 m
Height of SBP (H0) = 10 m
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 08 Issue: 03 | Mar 2021 www.irjet.net p-ISSN: 2395-0072
Figure 5 Class AA Tracked and wheeled vehicle load
3.3 Reinforcement Calculation:
3.3.1 Longitudinal Reinforcement:
Required Reinforcement percentage is calculated in Staad.Pro for control model.
Dead load and Live Load is applied on control model with one end fixed and other end pinned condition. As
an output Staad.Pro gives Percentage of Reinforcement 0.05%. But, as per IRC 112, in circular bridge pier minimum 1% percentage of reinforcement is required.
So as per this clause, we’ve provided 1% of reinforcement (Pt) [12].
So, Required Area of reinforcement,
Ast = Pt/100 × π/4 × D2
= 1/100 × π/4 × 52
Ast = 0.19635 m2 = 19.63 m2
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 08 Issue: 03 | Mar 2021 www.irjet.net p-ISSN: 2395-0072
Figure 11 Reinforcement Detailing of Slotted Bridge Pier (Level 1 to Level 2)
3.4.6 Reinforcement Detailing at Level 2:
Slab Detailing:
On top of slot, concrete weight comes, to take concrete weight we’ve created slab portion at the top of slot. Slab reinforcement is connected with longitudinal reinforcement which is running from L1 to L3. This slab is act as one-way slab that’s why the more reinforcements are provided along shorter direction. Again this reinforcement diameter is 40 mm, and spacing between reinforcement taken as 600 mm.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 08 Issue: 03 | Mar 2021 www.irjet.net p-ISSN: 2395-0072
1. As you can see in output results, U stands for Displacement. Maximum displacement occurs at the top of pier and it is quite obvious that effect of applied loads are maximum at that portion.
2. The value of displacement comes as +6.529 * 10-6 which is almost tends to ‘0’. 3. So we can say the control model is safe against applied loads. Which maximum as per IRC. We also have
detailed the pier as per IRC recommendation so it is also safe against the applied load.
4.2 Slotted Bridge Pier result summary
Figure 20 Slotted Bridge Pier Output
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 08 Issue: 03 | Mar 2021 www.irjet.net p-ISSN: 2395-0072
1. Maximum displacement in slotted Bridge Pier occurs at the top of pier and here also the same thing happen as control model that effect of applied loads are maximum at that portion.
2. In SBP, column 1 and 2 are main key component because on these slab is rested and self-weight of concrete above the slot is concentrated over this portion only. The main noticeable thing is that they are neither buckled nor does any noticeable displacement occur. So we can say it is safe against applied loads. Maximum displacement occurs at top and at a center the value of displacement up to 4.00 * 10-6 which is less as compare to top displacement.
3. Second observation we need to take is stability of slab. As per outcome it is clear that slab is also safe and
displacement on slab is also up to 4.67 * 10-6
5. CONCLUSIONS
1) Maximum displacement occurs at top of pier which is almost “0” and also same as compare to control model.
2) It also Prove that the amount of reinforcement used in control model is almost same amount of reinforcement used in
slotted Bridge Pier and there is no any riddle occurs.
3) To get above conclusion it is necessary, whatever reinforcement pattern used in Slotted Bridge Pier is in correct
manner and it is able to with stand against applied loads.
4) In slotted Bridge Pier it is necessary to provide reinforcement detailing which act as column on both the side of slot
and it must be running throughout the total height of pier.
5) In this column reinforcement detailing, the spacing of stirrups is kept less up to the height of the slot then it may
increase.
6) To restrain the weight of concrete over slot it is also necessary to provide slab over slot. Slab can take an excessive
weight of concrete over slot.
7) Slab reinforcement are must be tie-up in correct manner with longitudinal reinforcement which are running through
the height of pier.
8) Slab reinforcement along shorter direction act as main reinforcement and reinforcement against longer direction act
as secondary reinforcement.
9) If we used slotted Bridge Pier than other option it is economical. When we provide slot in between bridge pier,
The Volume of concrete for the slot is deducted, and the saving in concrete. We have used almost same amount of
reinforcement in SBP as used in control model. So we can say no other reinforcement required.
REFERENCES
[1] B. M. Sreedhara1, Manu Rao1, Sukomal Mandal , “Application of an evolutionary technique (PSO–SVM) and ANFIS in clear-water scour depth prediction around bridge piers”, The Natural Computing Applications Forum (2018)
[2] Yee-Meng Chiew, Member, ASCE, “Scour protection at bridge piers”, Journal of Hydraulic. Engineering. (1992)
[3] Ali Khodabakshi, Mojtaba Saneie, Abdolnabi Abdoh Kolahchi “Experimental study on effect of slot level on local scour around bridge pier” International Journal of Research in Engineering and Technology (2014)
[4] Mehdi Osroush , Seyed Abbas Hosseini, Amir Abbas Kamanbedast, Amir Khosrojerdi, “The effects of height and vertical position of slot on the reduction of scour hole depth around bridge abutments” Ain Shams Engineering Journal (2019)
[5] Viren kumar, Kittur G. Ranga Raju, and Nandana Vittal “Reduction of loacal scour around bridge piers using slots and collars” Journal of hydraulic engineering (1999)
[6] A.T. Moncada, J. Aguirre , J.C. Bolívar, E.J. Flores “Scour protection of circular bridge piers with collars and slots”, Journal of Hydraulic Research Vol. 47, No. 1 (2009), pp. 119–126
[7] M. Heidarnejad, M. Shafai Bajestan, and A. Masjedi “The effect of slot on scoring around piers in different position of 180 degrees bends”, World Applied Sciences Journal 8 (7): (2010)
[8] Hooman Hajikandi, Mahsa Golnabi, “Y-shaped and T-shaped slots in river bridge piers as scour countermeasures”, ICE Publishing (2016)
[9] Manouchehr HEIDARPOUR, Hossein AFZALIMEHR and Elham IZADINIA , “Reduction of local scour around bridge pier groups using collars”, International Journal of Sediment Research 25 (2010) 411-422
[10] Tafarojnoruz, R. Gaudio & F. Calomino, “Effect of a slotted bridge pier on the approach flow”, conference paper 2012 research gate
[11] IRC: 6-2014 “standard specifications and loads of practice and code of practive for road bridges”, “section 2 Loads and stresses”.
[12] IRC:112-2011 “Code of practice for concrete road bridges